Power Supply Board Section - Panasonic KX-FL612CX Service Manual

KX-FL612CX / KX-FL612CX-S

7.16. POWER SUPPLY BOARD SECTION

This power supply board uses the switching regulator method.
AC
Input
Input
Circuit
CN101
A-B Voltage Wave Form
0
C-D Voltage Wave Form
0
E-F
G-H Voltage Wave Form
0
[Input Circuit]
The input current goes into the input rectifier circuit through the filter circuit. The filter circuit decreases the noise voltage and
the noise electric field strength.
[Rectifier Circuit]
The input current is rectified by D101~ D104 and charges C106 to make DC voltage. Then it supplies power to the converter
circuit.
[Kick-on voltage circuit]
Bias is applied to the Q101 gate via this circuit when the AC power is turned on and Q101 begins operating.
Block Diagram
A
Rectifier
+
C106
Circuit
-
Kick-on
B
Voltage
Circuit
Triac
SCR101
CN102
Heat Lamp
R106
Surge
absorber
Converter circuit
Circuit
R107
C
Q101 Surge
absorber
D
circuit
Control
Circuit
IC101
O.C.L
Over voltage
Error Detecting
Circuit
Photo Trioc
Caupler PC102
Freq. SW Circuit
194
T101
G
24V
Output
Circuit
5V
Output
Circuit
IC201
E
H
F
PC101
PC103
24V
PGND
5V
DGND
HTRCTL
PDWN